Why are these employers not responding to my resume submissions for reporting job? (see more info in details)?

I know that jobs are scarce right now, but if an employers posts an ad that their company is hiring for a particular position and asks for resumes to be sent to their particular address, I'd think they wouldn't find it bothersome when someone actually does that. I was an english major in college, and I worked as a freelance reporter (on a regular basis) for a large, highly prestigious newspaper in town while pursuing my undergrad. Since then, I have been writing part-time for a magazine that advertises the town where I live. I have plenty of experience and education. I am "fresh out of college" and I don't have any "permanent" professional writing experience to put on my resume, but I do have excellent writing samples and excellent references. Why in the world aren't any of these places calling me back?? Even if I'm not first pick, I'd think at least a few of these employers would find me worthy of a "no thanks." Even after I try to send a follow-up e-mail, letter, etc., I get no response. Does anybody have any ideas about why this is happening? It's so inconsiderate, and I can't imagine any reason in the world why they are being so rude and completely ignoring me!!